Dental chair



July 14, 1931. W R 1,814,877

DENTAL CHAIR Filed Dec. 3l 1928 4 Sheets-Sheet l W GU01: n Q1 7 Hell]15. PI eber July 14, 1931. H. E. WEBER 1,814,877

DENTAL CHA I R Filed Dec. 31 i928 4 Sheets-Sheet 2 Hen/g5. Piber July14,1931. H. E. WEBER 1,814,877

DENTAL CHAIR il 1928 4 SheetsTSheet 3 46 43 N 47 52 no GROWN:

Jul 14, 1931.

H. E. WEBER 1,814,877

DENTAL CHAIR Filed Dec. 51, 1928 4 Sheets-Sheet 4 2 Q42 32 16/! Q7 28 7L 75 t I j; f 22 a i ll 9:8

bfelzlyl Weber Patented July 14, 1931 UNITED "STATES,

PATENT OFFICE HENRY E. WEBER, OF CANTON, OHIO, ASSIGN'OB TO THE WEBERDENTAL MANUFACTUR- ING COMPANY, OF CANTON, OHIO, A CORPORATION OF OHIO IDENTAL CHAIR Application filed December 31, 1928. Serial No. 329,474.

the back rest and foot rest, and the back rest,

even though balanced with the foot rest-in certain positions, islikelyto drop back suddenly when the securing clamp is released, and thepatient isleaning against the back rest. I 4

Accordingly the objects of the present improvements include theprovision of a dental chair of the foregoing description, and includingan improved back rest which clears and does not interfere with the otherparts of the chair during adjustment of the same, and including improvedyielding balancing means for the back rest and foot rest, preventingsudden dropping of the back rest,

and assisting raising of the same.

Further objects of the present improvements include the provision of anovel struc-,

ture and arrangement for the back rest and other parts of the chair, aswill be set forth in detail hereinafter.

A preferred embodiment of the invention is illustrated in theaccompanying drawings forming part'hereof, in which Figure 1 is a sideelevation of the im-' proved dental chair, the back rest and foot restbeing adjusted to accommodate a patient in substantially erect position;

Fig. 2, a fragmentary view similar to Fig. 1 illustrating a preferreddetachable foot Y rest platform for the chair;

Fig. 3, an enlarged sectional view illustrating details of the improvedback rest, as on line 33, Fig. 1;

Fig. 4, a view similar-to ing the back rest and foot rest of the chairFig. i 1, illustrat moved to accommodate a patient in a recliningposition, 'theback rest and adjustable support therefor clearing all theother parts of the chair;

Fig. 5, an enlarged fragmentary view similar to Fig. 1, with portionsbroken away, and illustrating novel details of the improvedback rest;

Fig. 6, a section view illustrating details of one of the improvedclamps thereof, as on line 66, Fig.

Fig. 7, a sectional view illustrating details of another of the improvedclamps thereof, as on line 77, Fig. 5;

Fig. 8, a View similar to Fig. 4, with portions broken away illustratingthe improved yielding, balancing means for the back rest and foot rest;and

Fig. 9, an enlarged fragmentary plan view thereof as on line 9-9, Fig.8, with portions removed and broken away.

Similar-numerals refer to similar parts throughout the drawings.

The improved dental chair indicated generally at 10 includes an elevatorindicated generally at 11, and upon the upper end of the raising andlowering jack 12 of the elevator a seat 13 is mounted.

The seat 13 is preferably mounted, as by means of pivot screws 14, onthe upper-end of the jack 12 for pivoting abouta horizontalaxis, and anywell known clamp actuated bya lever 15 is provided for securing the seat13 at any desired angular position with respectto the vertical axis ofthe elevator. As illustrated the upper surface of the seat ishorizontal.

An improved back rest indicated generally at 16 is mounted, as by meansof pins 17, at the rear of the seat for pivoting about a horizontalaxis, preferably parallel with the axis of the screws 14-; and a footrest indicated generally at 18 is mounted, as by means of screws 19, atthe front end of the seat 13 for pivoting about a horizontal axispreferably parallel with the axes of the screws 14 and of the pins 17. g

The foot rest '18 preferably includes a frame depending from the pivotalmount ing screws 19, and the frame 20 may have a childs foot platformindicated generally at 21 pivotally mounted therein.

For enabling the chair to be used not only by a dentist but by an earspecialist or the like, the platform 22 for the foot rest is preferablyremovably secured at the lower end of the frame 20, as by means ofnotches 23 in the one adapted for removable engagement with screw pins24 in the other.

The improved back rest 16 preferably includes an adjustable supportindicated generally at 25 extending upwardly from the pivot pins 17; andthe support 25 preferably includes a pair of laterally spaced upwardlyextending supporting rods 26, which extend through slide apertures 27formed in a sliding supporting head 28, and the sliding headmay besecured at any desired position on the supporting rods 26 by means of ascrew clamp 29 actuated by a lever handle 30.

The sliding head 28 is pivotally connected at each side of the chair, asby means ofa pivot screw 31 with one end of a back rest positioning link32, the other end of which is pivotally connected, as by means of apivot screw 33 with a side of the seat 13.

Accordingly, the relative angular position of the back rest with respectto he seat may be varied, by releasing the clamp 29 and moving thesliding head 28 upwards or downwards on the supporting rods 26, untilthe back rest has been pivoted about the pins 17 to the desiredposition, after which the clamp 29 may be actuated to reengage thesliding head 28 with the supporting rods 26.

During such pivotal movement of the support 25, the back rest ositioninglinks 32 will be pivoted about their mounting screws 33.

For simultaneously pivoting the foot rest 18 about its mount-ing screws19, one end of a connecting link 34 is pivotally connected as by meansof a pivot screw 35 with each positioning link 32, and the other end ofeach connecting link 34 is pivotally connected as by means of a pivotscrew 36 with a side of the frame 20, and the locations of the pivotscrews 35 and 36 with respect to the screws 33 and 19 are such that theback rest and foot rest will balance each other in any position.

A back rest mounting bracket 37 is longitudinally slidably secured tothe supporting head 28 preferably by means of an im proved automaticpistol grip clamp 38, and the mounting bracket 37 preferably includes amember 39 extending forwardly and downwardly therefrom, and spacedtherefrom, so that regardless of the position of any of the moving partsof the chair, the bracket member 39 will always clear the several chairparts.

An improved back rest .40 is yieldingly supported on the bracket member39, so that the back rest 40 will always clear all parts ofthe chair.

The bracket member 39 preferably includes arms 41 and 41 laterallyextending from the lower end thereof, and upon the extremities of whicharms, the back rest 40 is pivotally mounted adjacent its lower end, asby means of horizontally extending coaxial screws 42 and 42secured'respectively in the arms 41 and 41.

The back rest 40 is preferably yieldingly pivotally mounted on themember 39, as by means of a plunger 43, pivotally secured atits outerend as by means of a horizontal pivot screw 44 to the upper end of theback rest 40, and extending into a rearwardly extending and forwardlyopening socket 45 formed in the upper end of the mounting bracket 37.

The main body of the socket 45 is preferably larger in diameter than themain body of the plunger 43, and a stop collar 46 is preferably formedon the plunger 43 intermediate the ends thereof. Between the collar 46and the back rest, the plunger 43 extends through an externally threadedsleeve 47 which is screwed in the outer end ofrthe socket 45 for forminga stop cooperating with the stop collar 46 and limiting the outwardmovement of the plunger 43. A washer 48, )referably of resilientmaterial such as rubber, is interposed between the stop collar 46 andthe sleeve 47.

The inner end 49 of the socket 45 is preferably of reduced diameter forslidably receiving the inner end of the plunger 43, and for forming astop shoulder 50 cooperating with the stop collar 46 to limit inwardmovement of the plunger, and a washer 48,-preferably of resilientmaterial such as rubber, is interposed between the collar 46 and theshoulder 50.

The plunger 43 has preferably formed therein an axially extending socket51 opening from its inner end, and a compression spring 52 is insertedin the socket, and one end of the spring reacts against the end 53 ofthe plunger socket, and the other end reacts against the end 54 of thebracket socket, whereby the back rest 40 is mounted for yieldinglypivoting about the horizontal axis through the screws 42 and 42, but isincapable of any other displacement, and accordingly accommodates theback of the patient, without changing the relative position of anyparticular patient after the patient has resumed a normal posit-ion ofrest, subse quent to the patients movement to use a cuspidor or thelike.

The back rest mounting bracket 37, as aforesaid is longitudinallyslidable on the supporting head 28, preferably by providing each withlongitudinally extending tongues and grooves inter-fitting andlongitudinally sliding on tongues and grooves of the other. I

For securing the bracket 37 in any desired longitudinal position withrespect to the head, the improved automatic pistol grip clamp 38,includes a shank 55 secured in and extending rearwardly from the lowerend of the bracket 37 through a vertically extending slot 56 in the head28. i

A cam lever 57 is pivotally mounted on a horizontally extending pivotpin 58 secured at the outer end of the shank 55 rearwardly and beyondthe rear face 59 of the head 28, and a clamping washer 60 is interposedbetween the cam head 61 of the cam lever 57, and the rear face 59 of thesliding head 28, and the cam head61 is so shaped that pressure tendingto pivot the cam lever 57 towards the sliding head 28 clamps the washer60 against the rear surface 59 thereof, and secures the mounting bracket37 in engagement therewith at any desired longitudinal position of themounting bracket with respect to the head.

Yielding means are provided for normally urging the cam lever 57 towardsthe head 28 for clamping the bracket on the head, by a compressionspring 62, one end of which reacts against the rear side of the camlever 57 and the other end of which reacts against a pistol grip casing63, which is supported on the outer ends of the pin 58, and in whichcasing the cam lever is preferably arranged to pivot.

The automatic pistol grip clamp 38 will thus release the bracket 37 fromengagement with the head 28, by squeezing the pistol grip 63 and the camlever 57, after which the bracket 37 may be slid longitudinally up anddown to any desired position of elevation.

Instantaneously upon releasing the pistol grip and cam lever, thebrackets 37 will be secured in engagement with the head 28.

A head rest indicated generally at 64 is longitudinally slidably securedat the upper end of the bracket 37, by clamping means indicatedgenerally at 65, and which are.

similar to the clamp 38.

The back rest 40 preferably includes a metallic plate 66 curved toconform with the shape of the back, and preferably integrally cast froman aluminum alloy.

Rearwardly extending lacing hooks 67, are formed on the back face of theplate 66, and a pad 68 preferably of resilient material is laid againstthe front face of the plate 66. A covering 69 of leather or the like, ispulled taut over the front of the pad '68 and the ends of the pad andthe plate, and secured by means of a lacing 70, which passes The hooks67 and lacing 70 are preferably cludes a reciprocating rod 74, one end:of which is'pivotally connected with an upper end member of the footrest frame 20, as by means of a hook 76 extending through asuitableaperture in the foot rest frame member 75. I

i The other end of each rod 74 preferably extends through a suitableaperture provided in one of a set of lugs 77 depending from the seat 13.

At the rear side of each lug 77 the other end of each rod 74 is providedat its extremity with a preferably removable nut head 78 screwedthereon, and a compression spring 79 is interposed between each head 78and each lug 77.

The springs 7 9 reacting between the heads 78 and the lugs 77 thusyieldingly balance the back rest and foot rest, and prevent suddendropping of the back rest, and assist raising of the same, since thesprings 79 will be loaded to a maximum when the back rest is inreclining position.

I claim: 7

1. A dental chair including a seat, a back rest support pivotallymounted on the seat, a foot rest pivotally mounted on the seat, meansoperatively connecting the back rest support and the foot rest forsimultaneously pivotally moving the one when the other is pivotallymoved, a mounting bracket secured upon the support and including amember extending therefrom and spaced from the operating means forclearing the same during movement thereof, a back rest pivotally mountedon the member, and means connected between the foot rest and seat foryieldingly resisting pivotal movement-of the back rest.

2. A dental chair including a seat, a back rest support pivotallymountedon the seat, a foot rest pivotally mounted on the seat, means operativelconnecting the back rest support and the 'oot rest for simultaneouslypivotally moving the one when the other is pivotally moved, a mountingbracket secured upon the support and including a member extendingtherefrom and spaced from the operating means for clearing the sameduring movement thereof, and the member including arms extendinglaterally thereof, a back rest pivotally mounted on the arms, and meansconnected between the foot rest and seat for yieldingly resistingpivotal movement of the back rest.

3. A dental chair including a seat, a back rest support pivotallymounted on the seat, a foot rest support pivotally mounted on the seat,a sliding head adjustably mounted on the back rest support, meansoperatively connecting the sliding head and the foot rest forsimultaneously moving the sliding head when the foot rest is pivotallymoved, a.

mounting bracket slidably secured to the sliding head and including abracket arm extending therefrom, a back rest pivotally connected at itsbottom side with the bracket arm and yieldingly connected at its upperside to the mounting bracket, and a. head restsupport slidably mountedon the mounting bracket.

In testimony that I claim the above, I have hereunto subscribed my name.

HENRY E. WEBER.

